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package bwrap
import (
"os"
)
/*
Bind binds mount src on host to dest in sandbox.
Bind(src, dest) bind mount host path readonly on sandbox
(--ro-bind SRC DEST).
Bind(src, dest, true) equal to ROBind but ignores non-existent host path
(--ro-bind-try SRC DEST).
Bind(src, dest, false, true) bind mount host path on sandbox.
(--bind SRC DEST).
Bind(src, dest, true, true) equal to Bind but ignores non-existent host path
(--bind-try SRC DEST).
Bind(src, dest, false, true, true) bind mount host path on sandbox, allowing device access
(--dev-bind SRC DEST).
Bind(src, dest, true, true, true) equal to DevBind but ignores non-existent host path
(--dev-bind-try SRC DEST).
*/
func (c *Config) Bind(src, dest string, opts ...bool) *Config {
var (
try bool
write bool
dev bool
)
if len(opts) > 0 {
try = opts[0]
}
if len(opts) > 1 {
write = opts[1]
}
if len(opts) > 2 {
dev = opts[2]
}
if dev {
if try {
c.Filesystem = append(c.Filesystem, &pairF{DevBindTry.String(), src, dest})
} else {
c.Filesystem = append(c.Filesystem, &pairF{DevBind.String(), src, dest})
}
return c
} else if write {
if try {
c.Filesystem = append(c.Filesystem, &pairF{BindTry.String(), src, dest})
} else {
c.Filesystem = append(c.Filesystem, &pairF{Bind.String(), src, dest})
}
return c
} else {
if try {
c.Filesystem = append(c.Filesystem, &pairF{ROBindTry.String(), src, dest})
} else {
c.Filesystem = append(c.Filesystem, &pairF{ROBind.String(), src, dest})
}
return c
}
}
// WriteFile copy from FD to destination DEST
// (--file FD DEST)
func (c *Config) WriteFile(name string, data []byte) *Config {
c.Filesystem = append(c.Filesystem, &DataConfig{Dest: name, Data: data, Type: DataWrite})
return c
}
/*
CopyBind copy from FD to file which is readonly bind-mounted on DEST
(--ro-bind-data FD DEST)
CopyBind(dest, payload, true) copy from FD to file which is bind-mounted on DEST
(--bind-data FD DEST)
*/
func (c *Config) CopyBind(dest string, payload []byte, opts ...bool) *Config {
var p *[]byte
c.CopyBindRef(dest, &p, opts...)
*p = payload
return c
}
// CopyBindRef is the same as CopyBind but writes the address of DataConfig.Data.
func (c *Config) CopyBindRef(dest string, payloadRef **[]byte, opts ...bool) *Config {
t := DataROBind
if len(opts) > 0 && opts[0] {
t = DataBind
}
d := &DataConfig{Dest: dest, Type: t}
*payloadRef = &d.Data
c.Filesystem = append(c.Filesystem, d)
return c
}
// Dir create dir in sandbox
// (--dir DEST)
func (c *Config) Dir(dest string) *Config {
c.Filesystem = append(c.Filesystem, &stringF{Dir.String(), dest})
return c
}
// RemountRO remount path as readonly; does not recursively remount
// (--remount-ro DEST)
func (c *Config) RemountRO(dest string) *Config {
c.Filesystem = append(c.Filesystem, &stringF{RemountRO.String(), dest})
return c
}
// Procfs mount new procfs in sandbox
// (--proc DEST)
func (c *Config) Procfs(dest string) *Config {
c.Filesystem = append(c.Filesystem, &stringF{Procfs.String(), dest})
return c
}
// DevTmpfs mount new dev in sandbox
// (--dev DEST)
func (c *Config) DevTmpfs(dest string) *Config {
c.Filesystem = append(c.Filesystem, &stringF{DevTmpfs.String(), dest})
return c
}
// Mqueue mount new mqueue in sandbox
// (--mqueue DEST)
func (c *Config) Mqueue(dest string) *Config {
c.Filesystem = append(c.Filesystem, &stringF{Mqueue.String(), dest})
return c
}
// Tmpfs mount new tmpfs in sandbox
// (--tmpfs DEST)
func (c *Config) Tmpfs(dest string, size int, perm ...os.FileMode) *Config {
tmpfs := &PermConfig[*TmpfsConfig]{Inner: &TmpfsConfig{Dir: dest}}
if size >= 0 {
tmpfs.Inner.Size = size
}
if len(perm) == 1 {
tmpfs.Mode = &perm[0]
}
c.Filesystem = append(c.Filesystem, tmpfs)
return c
}
// Overlay mount overlayfs on DEST, with writes going to an invisible tmpfs
// (--tmp-overlay DEST)
func (c *Config) Overlay(dest string, src ...string) *Config {
c.Filesystem = append(c.Filesystem, &OverlayConfig{Src: src, Dest: dest})
return c
}
// Join mount overlayfs read-only on DEST
// (--ro-overlay DEST)
func (c *Config) Join(dest string, src ...string) *Config {
c.Filesystem = append(c.Filesystem, &OverlayConfig{Src: src, Dest: dest, Persist: new([2]string)})
return c
}
// Persist mount overlayfs on DEST, with RWSRC as the host path for writes and
// WORKDIR an empty directory on the same filesystem as RWSRC
// (--overlay RWSRC WORKDIR DEST)
func (c *Config) Persist(dest, rwsrc, workdir string, src ...string) *Config {
if rwsrc == "" || workdir == "" {
panic("persist called without required paths")
}
c.Filesystem = append(c.Filesystem, &OverlayConfig{Src: src, Dest: dest, Persist: &[2]string{rwsrc, workdir}})
return c
}
// Symlink create symlink within sandbox
// (--symlink SRC DEST)
func (c *Config) Symlink(src, dest string, perm ...os.FileMode) *Config {
symlink := &PermConfig[SymlinkConfig]{Inner: SymlinkConfig{src, dest}}
if len(perm) == 1 {
symlink.Mode = &perm[0]
}
c.Filesystem = append(c.Filesystem, symlink)
return c
}
// SetUID sets custom uid in the sandbox, requires new user namespace (--uid UID).
func (c *Config) SetUID(uid int) *Config {
if uid >= 0 {
c.UID = &uid
}
return c
}
// SetGID sets custom gid in the sandbox, requires new user namespace (--gid GID).
func (c *Config) SetGID(gid int) *Config {
if gid >= 0 {
c.GID = &gid
}
return c
}
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